Securities - Schedule of amortized cost and fair value of the investment securities portfolios by contractual maturity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Securities
Estimated remaining term			3 years 9 months 18 days
Amortized Cost
One to five years	$ 1,953		$ 1,953
Residential mortgage-backed	12,939		12,939
Total	14,892		14,892
Fair Value
One to five years	2,024		2,024
Residential mortgage-backed	13,429		13,429
Total	15,453		15,453
Securities pledged	641		641		$ 719
Securities of any one issuer, other than U.S. Government, greater than 10% of shareholders equity	0		$ 0		$ 0
Shareholders equity representing a concentration risk for any one securities investment (as a percent)			10.00%		10.00%
Sales of securities	$ 0	$ 0	$ 0	$ 0